If an object has luster, is brittle, and is a semi-conductor, what category would best describe it? A. Metal

B. Non-metal

C. Metalloids

D. Isotopes

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.